Liquid-pump



K. DELLGREN.

LIQUID PUMP.

APPLICATION FILED NOV. I4. 1918.

Patented J an. 6, 1920.

KARL DELLGREN, orvAs'rEavI swnnan".

LIQUID-PUMP.

Specification of Letters Patent.

Patented Jan. 6, 1920 a Application filedrNovember 14, 1918. ,Serial No.262,570.

To all whom tit may come 7 Be it known that I, ARL DELLGREN, a citizenof the Kingdom of Sweden, residing at Vastervik, Sweden, have inventednew and useful Improvements in Liquid-Pumps, of which the following is aspecification.

This invention relates to. liquid pumps, and more particularly to feedpumps for hydraulic machines, fuel pumps for internal combustion enginesand the like, the object in View being to produce a compensating pump ofthe class referred to or, in vother words, a pump in which the workingstroke thereof will be automatically regulated in accordance with thespeed of the machine or engine, the latter in turn being controlled bymeans of a regulatingvalve, a distinct relationship being thusestablished between the plunger of the pump and the regulating valve sothat the adjustment of the valve has an important and definite effect onthe operation of the pump plunger.

A further object of the invention is to provide for the easy andaccurate regulation of the amount of liquid fed to the'machine or enginein accordance with the speed and power desired; also to produce a pumpparticularly required for great variation in speed and power while inoperation.

With the above and other objects in View, theinvention consists in thenovel construction, combination and arrangement of parts, as hereindescribed, illustrated and claimed.

In the accompanying drawings:

Figure 1 is aview partly in elevation and partly in section of the pumpmechanism of this invention.

Fig. 2 is a similar view showing the same principle but involving amodified arrangement of some of the parts.

Referring to the drawings, A generally designates the body of the pumpwhich comprises a barrel shaped or cylindrical extension 1, a similarextension 2 arranged in opposition to and extending in the reverse di-'rection from the extension or cylinder 1 and a cylindrical extension 3shown as arranged perpendicularly to the extensions or cylinders 1 and2. The cylindrical extension 1 forms an inlet valve chamber 4 While theextension2 forms an outlet valve chamber 5. 6 designates the inlet valvewhich cooperates 'nated generally at B,

with, a seat 7 and is normally held against 1ts seat by means of aspring 8 engaging a shoulder 9 on the stem of said inlet valve 6.

The outlet valve shown at 10 is normally held against its seat 11 bymeans of a spring 13 which bears against a plug 14 threaded into theopen end of the valve chamber 5.

'15 designates a similar plug threaded into the end of the inlet valvechamber 4. 16 represents the inlet pipe leading from a sultablereservoir and 17 a pipe leading from the pump body to a regulating valvedesigthe same comprising a valve body or casing 18 provided with aninternal valve seat'19 with which cooperates a valve 20 having athreaded and adjustable connection at 21 with the valve casing andhaving a projecting end portion 22 adapted to be turned by any suitablemeans for ad- ]ustlng the valve 20 in relation to its seat 19, therebyregulating the amount of liquid which passes by the valve and reachesthe service pipe 23 leading to the machine or engine,

The pump piston or plunger 24 reciprocates through the gland 25 of astufling box formed by the tubular extension 3 above re ferred to andsaid plunger is shown in Fig. 1 as pivotally connected at 26 to oneelement of the pump driving mechanism, said element being shown in theform of a lever 27 which is pivotally connected at 28 to the rod 29 ofan eccentric connection embodying a strap 30 which encircles aneccentric 31 on a driving shaft 32 which of course may consist of anydesired shaft which revolves with and is driven by or forms a part ofthe machine or engine in question. The lever 27 opposite the pivoted end28 thereof is enlarged and rounded as shown at 33 and is confinedbetween a'stationary projection 34 preferably I roundin cross sectionand a yielding compensating in 35 forming part of a compensator whic inaddition to the pin 35 embodies a cylindrical housing or casing 36, aplug 37 detachably threaded into one end thereof and a compensatingspring 38 which is interposedlbetween the plug 37 and a shoulder 39 onthe compensating pin 35, the spring 38 being adapted to be compressedmore or less by ad usting the threaded plug 37.

In the operation of the pump above de-' scribed, the liquid is drawn inthrough the inlet valve and is discharged through the outlet valve bythe action ofthe plunger.

The plunger being operated by means of the shaft 32 and the rod 29 andlever 27, the other end of the lever is maintained in place between thestop 34 and the compensating pin or plunge1135. The pin 85 is resistedby the action of the spring 38 which in turn is controlled as to itsdegree of compression by the threaded plug 37 so that the initialpressure on the end 33 of the lever may be regulated. The amount ofliquid passing to the machine or engine is controlled by the regulatingvalve 20 which may be opened I thereby decreasing the amount of liquidsup-- ply to the machine or engine, resulting in a reduction of thespeed of the said machine or engine. If the regulating valve 20 isentirely closed, the lever 27 will work on the pivot 26 as a fixed pointand the compensating spring 38 will contract and expand equally with thestroke of the eccentric 31.

Under the arrangement illustrated in Fig. 2, the lever 27 is dispensedwith and the cocentric rod 29 is pivotally connected at 40 to onesection 41 of a compensator housing the main section of which isindicated at 42. The pump plunger 24 is extended into the housing 42through an opening 43 in the end thereof and is provided with a. fixedcollar or flange 44 against which bears one end of the compensatingspring 45, the opposite end of which may be seated against the innerextremity of the section 41 of the casing or housing 42. The principleinvolved in the construction illustrated in Fig. 2 is the same as thatinvolved in the construction illustrated in Fig. 1, the tension of thespring 45 being adjusted by turning the main section 42 of the housingor casing. Under either arrangement the adjustment of the tension of thespring 38' or 45, as the case may be, may be accomplished while the pumpis in operation. In all other respects, the operation is the same asthat described in connection with Fig. 1.

The amount of; liquid pumped to the machine or engine may be thus easilvregulated while the engine is in operation, the plunger obtaining a fullor partial stroke or none at all according to the adjustment of theregulating valve 20. The spring 38 the thus acts as a safety device inthat it prevents any possibility of an excessive pressurein the pump andliquid feed pipe. As a wholefthe device is particularly advantageous foruse in connection with hydraulic machines or in connection with enginesrequiring a great variation in speed while in operation as, for example,in engines of the marine type, automobiles and traction engines.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is:

1. In a liquid pump, the combination with the pump plunger and aregulating Valve for controlling the amount of liquid forced by thepump, of a lever pivotally connected intermediate its ends with saidpump plunger, means connected to one end of sa1d lever to oscillatesame, and means engaging with the other end of said lever for torming astationary fulcrum for said lever when the counter pressure upon theplunger due to the adjustment of said regulating valve does not exceed acertain value, while allowing the lever to swing without imparting anymotion to the plunger when said pressure exceeds said certain value.

2. In a liquid pump, the combination with the pump plunger and aregulating valve for controlling the amount of liquid forced by thepump, of a lever pivotally connected intermediate its ends with saidpump plunger, an eccentric rod connected to one end of said lever tooscillate same, and means engaging with the other end of said lever forforming a stationary fulcrum for said lever when the counter pressureupon the plunger due to the adjustment of said regulating valve does notexceed a certain value, while allowing the lever to swing withoutimparting any motion to the plunger when said pressure exceeds saidcertain value.

3. In a liquid pump, the combination with the pump plunger and aregulatin valve for controlling the amount of liqui forced by the pump,of a lever pivotally connected intermediate its ends with said pumpplunger, means connected to one end of said lever to oscillate same, astationary stop engaging with one side of .the other end of said leverfor forming a rigid fulcrum for said lever when moving in the directionfor effecting the suction stroke of the pump plunger, and a yieldingstop engaging with the opposite side of said last mentioned end of thelever.

4. In a liquid pump, the combination with the pump plunger and aregulating valve for controlling the amount of liquid forced by thepump, of a lever pivotally connected intermediate its ends with saidpump plunger, means connected to one end of said lever to oscillatesame, a stationary mentioned end of the lever, a spring acting stopengaging with one side of the other on said sliding abutment formaintaining end of said lever for forming a rigid fulit in engagementWith said lever, and means 1 orum for said lever when moving in the foradjusting the tension of said spring. direction for effecting thesuction stroke of In testimony whereof I have signed my the pumpplunger, a sliding abutment enname I gaging With the opposite side ofsaid last KARL DELLGREN.

